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Which of the following are correct examples for the given two characteristics of force systems? (i) All the forces are parallel to each other but not in the same plane. (ii) Not all forces lie in the same plane, but their lines of action pass through the same point.

Which of the following are correct examples for the given two characteristics of force systems? (i) All the forces are parallel to each other but not in the same plane. (ii) Not all forces lie in the same plane, but their lines of action pass through the same point. Correct Answer <p>(i) Weight of the benches in the classroom</p> <p>(ii) a tripod on which the camera is mounted</p>

Concepts:

The Free-body diagram or various forces acting on objects for given situations are shown below:

(A) weight of Benches in classroom:

All forces on benches are ∥ to each other, but lies in different plane.

Also, line of action of N1 and F1 are passes through one point.

(B) Force on a rod resting on wall

(N1, F1) and (N2, F2) are not parallel and also with line of action is also different.

(C) force acting on Moving Bus

 

(F1, F2) is not parallel with (N1, N2). Also, they are not passing through one point.

(D) Tripod on which camera mounted.

Tripod has three legs and three legs are jointed to point O. Each leg has one axial force.

 

   

F1, F2, F3 all are at 120° angle, so key are parallel and also they passes through one point O

(E) Train standing on platform:

 

since, train is standing there is no friction. only normal and gravity will act.

(N1, N2, M2g, M1g) all are lie in same plane and parallel But they are not passing through one point.

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